Steam-boiler



{No Model.)

WETN ESSES T. MGDONOUGH.

STEAM BOILER.

Patented Jan. v24.18 82.

N. PETERS, Pnuxvuehogmpmr, wmingmn. D. c.

Ntren STATES PATENT OFFICE.

THOMAS MGDONOUGH, OF MONTOLAIR, NEW JERSEY.-

sTlaAivi-eoitea.

SPECIFICATION forming part of Letters Patent No. 252,768, dated January 24, 1882.

Application tiled October 10, 1881.

To all whom it may concern:

Be it known that I, THOMAS MoDoNoUGn, acitizen of the United States, resident at Montclair, in the county'of Essex and State ot' New Jersey, have invented a new and valuable Inlprovementin SteamBoilers; and l do hereby declare that the following is a full, clear, and

exact description of the construction and operation ofthe same, reference being' had to the annexed drawings, making a part of this specification, and to the letters and liguri s ot' reference marked thereon.

Figure l of the drawings is a representation ot' a longitudinal section of my invention. Fig. 2 is a side elevation thereof', and Fig. 3 is across-section of the same.

rlhis inventionhas relation to steam-boilers in which water is injected to the boiler, coinmonly known as Hash-boilers, and it consists in the novel construction and arrangement of a boiler provided with interior sloping gutters extending longitudinally of the same, and e'xternal screw-danges or disks extending from end to end cf the boiler, as will be hereinafterfully described, and particularly pointed out in the claims.

In the ordinary small power or dash boilers the injected water is not equally distributed, and consequently some parts ofthe boiler are unduly heated and thereby strained. To obviate these difficulties I provide the inner sides cfa plain cylindrical or rectangular boiler, A, with sloping channels or gutters B, as shown, so that the water pumped or injected against the roof of the boiler will part run down the gutters B. In practice the force ot' the jet against the iron scatters the water sufticiently to cause part of it `to run down the gutters to the bottom and part to drop at once to the bottom, so that the water is very equally distributed. The water falling upon the gutters ilows through them successively at the sides until it reaches the bottom of the boiler.

-The exterior of the boiler is provided with integral spiral danges O, although metal disks may be employed in lieu thereof, in order to produce uninterrupted conductivity. rIhe tlanges of the spiral O are three-eighths inch thick at the boiler, and extend tive inches therefrom, and terminate inpoints one-eighth inch (No model.)

thick. l adopt this length-tive inches-because I have found from practice that if made longer their edges will be melted away, thus demonstrating that the heat is furnishedv faster at a distance greater than ve inches from the boiler than it can be conducted away and imparted to the water. The object ot' these lianges is to absorb as much on their two sides of tive inches as the water will take up on the three'eighths or internal boiler-edge. The heat is very evenly distributed by this form of construction, so that no part of the shell becomes unduly heated. A greater or lesser quantity of water in the boiler is unimportant, the supply of steam regular, and when the boileris emptied and water injected it dose not take the spheroidal form, the internal construction keeping the iron at the same temperature throughout its inner surface.

I am aware that external projections have been used for various purposes, such as for directing the currents of air or as radiators to diffuse heated currents externally, and these I do not claim.

rlhe injection-tube a extends a short distance within the boiler, as shown, and the escape b for the steam may be located above it; but this arrangement may be varied without departing from my invention.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is- 1 l. The herein-described method of absorbing furnace-heat, consisting in injecting water against the roof of a boiler and conducting the portions that do not fall directly to the bottom ot' the same by sloping gutters at the sides thereof, as set forth.

2. In a steam-boiler, the boiler A, provided with the interior sloping gutters, B, and the external spiral flanges, C, combined and operating substantially as and for the purposes specified.

In testimony that Iclaim the above I have hereunto subscribed my name in the presence of two witnesses.

THOMAS MGDONOUGH. 

